首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 46 毫秒
1.
This paper examines spatio-temporal characteristics of an oasis economy and its relationship with water and mineral resources in the Turim River Basin from 1965 to 2005. A spatial autocorrelation model, the center of gravity model, and index system of the regional central city are used to probe the evolution laws of spatial structure of oasis economy. The study finds that: 1) The economic centre of gravity, whose variation track during this period follows linear rote law, was moving from headstream to middle reaches of the Tarim River. 2) Positive spatial autocorrelation which showed a waving and ascending trend of regional economy was significant and the neighbor effect of regional economic growth was strengthened continuously. 3) The regional economic centre was located in Hotan City before 1980, moved to Aksu City during the 1980s and to Korla City after 1990. We conclude that above all, during the recent four decades the evolution of the oasis economy in this region has gone through three stages: a traditional agriculture stage (before 1980), oasis agriculture and agricultural product processing stage (1980-1990) and oasis energy industry stage (after 1990). Furthermore, the dependence degree of the oasis economy on natural resources in different stages are studied by using dominance index, regression model, and grey relation method, which shows that an oasis economy highly depends on water resources in the oasis agriculture and agricultural product processing stage while it depends more on mineral resources such as oil and natural gas during the oasis energy industry stage.  相似文献   

2.
This paper explores the method of comprehensive evaluation of water resources carrying capacity and sets up an evaluation model applying the fuzzy comprehensive evaluation method. Based on the data of nature, society, economics and water resources of the Tarim River Basin in 2002, we evaluated the water resources carrying capacity of the basin by means of the model. The results show that the comprehensive grades are 0.438 and 0.454 for Aksu and Kashi prefectures respectively, where the current water resources exploitation and utilization has reached a relative high degree and there is only a very limited water carrying capacity, 0.620 for Kizilsu Kirgiz Autonomous Prefecture, where water resources carrying capacity is much higher, and in between for Hotan Prefecture and Bayingolin Mongolian Autonomous Prefecture. As a whole, the comprehensive grade of the Tarim River Basin is 0.508 and the current water resources exploitation and utilization has reached a relative high degree. Thus, we suggest that the integrated management of the water resources in the basin should be strengthened in order to utilize water resources scientifically and sustainably.  相似文献   

3.
In the modern times ,the population growth,development of industrial and agricultural production and the petroleum exploitation,brought about the unceasing expansion of artificial oasis and abrupt increase of water demand .The artificial hydraulic irrigation engineering took the place of the natural river systerm,the reservoirs took the placeof natural lakds,which in turn enhanced the space-time redistribution of surface water based on the natural evolution,and so did groundwater.The groundwater recharge reduced 26.2% in 46 years from 1950 to 1995 in the southern piedmont fold plain of Tarim Basin due to mean yearly population increase rate of 27.7‰ and associated with the water use rate increasing from 24.6% to 58.4%.At the same time the artificial water system seepage give primary play to groundwater recharge,which is up to 57.6% whilst that of the natural system reduce to 33.7%.As a result,groundwater level drop 3-5m widespread except some irrigation area and surrounding of plain reservoir.Sping water discharge also reduce about 37.6% and discharge some continuously move away to the north with the value of 0.5-1.2km in the past 40 years.  相似文献   

4.
塔里木河流域综合治理生态要素变化的遥感分析   总被引：1，自引：0，他引：1  
采用多种类、多时相遥感数据对塔里木河流域综合治理后的耕地变化和干流绿色走廊带的植被、沙质荒漠化和盐碱质荒漠化等主要生态要素进行了动态监测,结果表明:(1)1999-2008年间,流域耕地面积逐步扩大,从167.17万hm2增长到207.51万hm2。其中,塔里木河干流区耕地面积增加最快,叶尔羌河、开都河-孔雀河与和田河三流域稳步增加,而阿克苏河流域耕地面积先增加,后减少。除阿克苏河流域外,塔里木河流域等其他三流域和塔里木河干流,在2004-2008年间的面积增长速度明显大于1999-2002年和2002-2004年两个时段。(2)2002-2004年间,塔里木河干流绿色走廊带生态环境明显改善,主要表现为植被覆盖度的提高、沙质荒漠化土地面积的减小和强度减弱、盐碱质荒漠化土地的强度减弱等。耕地面积的大幅度增加引起的灌溉用水量的增大,对长期采用输水实现塔里木河的生态功能恢复具有长期性制约作用。  相似文献   

5.
黑河流域地处西北干旱区,水资源短缺是限制其中游绿洲农业发展、下游生态环境保护的首要原因。该流域的中游绿洲农业用水约占总用水量的80%,因此农业节水对流域发展至关重要。在干旱区绿洲农业节水探索中,众多学者主张通过节水技术来提高用水效率,而关于农业种植结构调整对农业节水影响的定量研究较少。本文采用2012年黑河流域蒸散发数据、土地利用数据、降水数据和农业经济统计数据,定量分析黑河中游主要作物需水特征和用水效率差异,尝试从调整作物种植结构角度为其绿洲农业节水提供依据。结果表明：(1)研究区4种主要作物中,玉米生长期需水量最大,其次为小麦、油菜和大麦;(2)考虑降水补给,发现大麦和油菜生长需水可很大程度上依赖降水,而小麦和玉米则需要灌溉,且玉米灌溉需水量远超小麦;(3)作物用水效率由高到低依次为大麦、油菜、小麦和玉米。从用水效率角度而言,考虑种植区位,在黑河中游适当扩大小麦种植规模更有利于提高中游农业用水效率。  相似文献   

6.
An oasis is a kind of medium-sized or small-sized non-zonal landscape coming into being in the dry climate and supported by natural rivers in deserts, which is characterized by the comparatively high primary pro- ductivity and has the mesophytic plants or xero-mesophytic plants as the dominant vegetation (Jia, 1996). The oasis system, first of all, is a subsystem within the macro system of “mountain-oasis-desert” in the arid region. It is also a complex system where the natural and artificia…  相似文献   

7.
柯坪地区物源及演化与塔里木盆地的古地理位置密切相关。通过对下志留统碎屑锆石的形态特征和U-Pb年龄分布特征进行分析,系统研究了柯坪地区下志留统的物源及其演化。结果表明:柯坪地区下志留统锆石均为岩浆锆石,锆石U-Pb年龄反映的是成岩年龄或结晶年龄,可有效指示物源区;下志留统柯坪塔格组的物源区主要为沙雅隆起西部、塔中隆起及塔西南前缘隆起,之后受海侵的影响,塔中隆起被海水淹没,下志留统塔塔埃尔塔格组的物源区演变为沙雅隆起西部、塔西南前缘隆起及塔中隆起的南部于田、康西瓦地区;满加尔凹陷的存在使得柯坪地区与塔中、塔东地区的物源具有很大的差异;900～700Ma的锆石年龄谱表明,塔里木地块与冈瓦纳大陆具有一定的亲缘关系。  相似文献   

8.
塔里木盆地奥陶系烃源岩二次生烃研究   总被引：1，自引：0，他引：1  
为研究海相烃源岩二次生烃规律和塔里木盆地生排烃规律,以塔里木盆地奥陶系烃源岩为研究对象,首先通过构造-热演化史和生烃史研究得出,塔里木盆地典型构造单元奥陶系烃源岩具有二次生烃的特征,并且起始成熟度和生烃期次不同.然后选取自然条件下演化至不同起始成熟度的奥陶系海相烃源岩,采用热压模拟实验方法系统研究其二次生烃规律.研究表...  相似文献   

9.
通过天然气中He同位素组成来研究天然气的成气机制。用VG-5400静态真空质谱计测定了采自塔里木盆地古生代和中生代地层中天然气的He同位素,其He/4He=2.58×10-8～8.33×10-8,R/Ra=0.019～0.059Ra,平3均值为0.031Ra,而我国东部几个主要含油气盆地天然气的R/Ra平均比值则变化于1.21～2.30Ra。He同位素组成对比研究表明,东部含油气盆地成烃作用是在幔源热流驱动下热水流体与烃源岩水岩反应形成的,而塔里木盆地成烃热源则主要是盆地地热增温热水流体与烃源岩水岩反应形成的。  相似文献   

10.
ＷＡＴＥＲＲＥＳＯＵＲＣＥＩＮＱＩＬＩＡＮＭＯＵＮＴＡＩＮＯＵＳＲＥＧＩＯＮＡＮＤＩＴＳＩＮＦＬＵＥＮＣＥＯＮＥＣＯ－ＥＮＶＩＲＯＮＭＥＮＴＯＦＨＥＸＩＣＯＲＲＩＤＯＲ￥ＣｈｅｎＣｈａｎｇｙｕ（ＭｅｔｅｏｒｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＧａｎｓｕＰ...  相似文献   

11.
To manage water resources effectively, a multiscale assessment of the vulnerability of water resources on the basis of political boundaries and watersheds is necessary. This study addressed issues on the vulnerability of water resources and provided a multiscale comparison of spatial heterogeneity under a climate change background. Using improved quantitative evaluation methods of vulnerabil- ity, the Theil index and the Shannon-Weaver index, we evaluated the vulnerability of water resources and its spatial heterogeneity in the Haihe River Basin in four scales, namely, second-class water resource regions （Class II WRRs）, third-class water resource regions （Class III WRRs）, Province-Class II WRRs, and Province-Class III WRRs. Results show that vulnerability enhances from the north to south in the different scales, and shows obvious spatial heterogeneity instead of moving toward convergence in multiscale assessment results. Among the Class II WRRs, the Tuhai-Majia River is the most vulnerable area, and the vulnerability of the Luanhe River is lower than that of the north of the Haihe River Basin, which in turn is lower than that of the south of the Haihe River Basin. In the scales of Class III WRRs and Province-Class III WRRs, the vulnerability shows obvious spatial heterogeneity and diversity measured by the Theil index and the Shannon-Weaver index. Multiscale vulnerability assessment results based on political boundaries and the watersheds of the Haihe River Basin innovatively provided in this paper are important and useful to characterize the real spatial pattern of the vulnerability of water resources and improve water resource management.  相似文献   

12.
绿洲生态环境动态调控模型及系统概念设计应用   总被引：2，自引：0，他引：2  
绿洲是荒漠中的特殊景观 ,在干旱、半干旱地理系统中有着重要的生态意义 ,是该系统中物质、能量和信息交流的主要界面。绿洲的生态环境脆弱 ,随着人类活动的加剧 ,绿洲生态系统的稳定性 ,将面临更加严峻的考验。利用先进的空间信息技术 (包括遥感和 GIS) ,可以建立绿洲生态环境动态调控系统 ,使之服务于绿洲的稳定、可持续发展。本文依据水资源的供需平衡原理和水资源利用与生态环境之间的耦合关系对基于遥感 (RS)和 GIS的绿洲生态环境动态调控的模型进行了概念设计,并在此基础上讨论了绿洲生态环境动态调控系统的设计。  相似文献   

13.
The research on the present situation of soil and water development and utilization in Shiyang River Basin shows that water resources and eco-environment situation in this area are near the edge of collapse. Since the water crises occurred in the 1970s, problems caused by continuous decrease of water resources have been becoming serious year by year and eco-environment crisis occurred as a consequence. Up to now, 10 380ha of irrigated lands have been abandoned due to sand coverage and water shortage in the basin. Ground water was over exploded in Wuwei and Minqin because of water shortage. Ground water table in many places dropped under 5m (which is the ecology water table level), thus about 3000ha of Elaeagnus angustifolia forest come to dead and another 5800ha become feeble, and wind-drift sand near the oasis become alive. According to the current situation, if water utilization scope was not enlarged, a water transfer volume of 600×106m3/a from other areas will be suitable to keep water resources and eco-environment safety in the basin, and also 70×106m3/a will be left as spare water. Under this condition the water resources and eco-environment of the basin can reach the critical safety line of 2.032×109m3/a; or if 180×106m3 of water can be transferred from other areas, the water resources can reach the safety warning line of 1.732×109m3/a. Foundation item: Under the auspices of the National Natural Science Foundation of China (No. 40235053) and Lanzhou Jiaotong University "Qinglan" Foundation Biography: ZHANG Ji-shi (1963-), male, a native of Tongwei of Gansu Province, senior engineer, specialized in water resources and climate change in Northwest China. E-mail: zjs1963@yahoo.com.cn; hangjs@mail.lzjtu.cn  相似文献   

14.
水汽输送及降水模式对流域水文模型及水资源研究具有重要意义。汉江流域水资源对南水北调以及下游生态环境有重要影响,研究汉江流域水汽输送和降水的时空分布特征是水文模拟和水资源环境管理的基础。本文利用NCEP/NCAR再分析资料和汉江流域19个气象站点的降水资料,以及GIS数据库和分析工具,分析了汉江流域的水汽通量、可降水量、实测降水量和降水转换率的计算方法;以汉江流域1998年7月的气候再分析资料和降水资料为例,计算并分析了汉江流域1998年7月可降水量与实测降水量的空间分布特征,以及降水转化率的分布特征;探讨了水汽输送、可降水量、实测降水量,以及降水转化率的相关性和空间分布特征。通过分析汉江流域1981-2010年的可降水量和实际降水量的分布表明,汉江流域可降水量与降水量变化趋势基本相同,降水转换率近年有所增加。  相似文献   

15.
ＥＣＯＬＯＧＩＣ ＥＮＶＩＲＯＮＭＥＮＴ ＯＦ ＴＡＲＩＭ ＲＩＶＥＲ ＡＮＤ ＩＴＳ ＰＲＯＴＥＣＴＩＶＥ ＰＲＯＧＲＡＭＭＥ ＣｈｅｎｇＱｉｃｈｏｕ（程其畴）ＸｉｎｊｉａｎｇＩｎｓｔｉｔｕｔｅｏｆＧｅｏｇｒａｐｈｙ，ｔｈｅＣｈｉｎｅｓｅＡｃａｄｅ...  相似文献   

16.
运用生物扰动指数和遗迹组构组分图解方法对塔里木盆地塔中地区上泥盆统东河塘组河口湾沉积中的遗迹化石和生物扰动构造进行了描述和分析,从中发现两类遗迹组构,其中Ｔｈａｌａｓｓｉｎｏｉｄｅｓ 遗迹组构发育在纯净砂岩中,与河口湾潮汐沙坝有关;Ｓｋｏｌｉｔｈｏｓ － Ｐａｌａｅｏｐｈｙｃｕｓ 遗迹组构发育在砂、泥互层沉积中,与河口湾潮坪有关。  相似文献   

17.
The oasis-desert ecotone is a fragile ecological zone that is affected both by oasis and desert conditions. To understand the impact of the differences in wind power, and the influence of wind erosion and deposition on the ecotone, meteorological data and con- temporaneous wind erosion and deposition data were collected on the southern margin of Tarim Basin with serious sand-blown hazards. The wind velocity, average wind velocity, sand drift potential （DP）, resultant sand drift potential （RDP）, and sand transportation rate decrease significantly and successively across four landscape types with increasing vegetation coverage （VC）. Flat surfaces and areas of shifting sandy ground experience intense wind erosion with fast movement of mobile sand dunes; semi-fixed sand areas experience ex- tensive wind deposition but only slight wind erosion; and fixed sand areas experience only slight wind erosion and deposition. Volume of wind erosion on bare newly reclaimed farmland is up to 6.96 times that of bare shifting sandy ground. Wind erosion volume per unit area and VC follow an exponential function relationship in natural conditions, while wind deposition volume per unit area does not conform to any functions which has close relationship with vary topography and arrangement patterns of vegetation besides for VC. The results indicate that the volume of wind erosion has a close correlation with VC, and different types and distribution patterns of topog- raphy and vegetation also profoundly influence the wind deposition volume in the field, and underground water tables in different land- scape types control the plant community distribution. Keywords： wind erosion; wind deposition; oasis-desert ecotone; vegetation coverage （VC）; topography; Cele County  相似文献   

18.
Due to the extremely arid climate in the western Qaidam Basin, the groundwater almost becomes the single water source for local residents and industrial production. It is necessary to know the reliable information on the groundwater cycle in this region for reasonable and sustainable exploitation of the groundwater resources with the further execution of recycling economy policies. This study focused on the recharge, the flow rate and the discharge of groundwater in the western Qaidam Basin through investigations on water chemistry and isotopes. Hydrological, chemical and isotopic characteristics show that the groundwater in the western Qaidam Basin was recharged by meltwater from new surface snow and old bottom glaciers on the northern slope of the Kunlun Mountains. In addition, the results also prove that the source water is enough and stable, and the rates of the circulation and renewal of the groundwater are relatively quick. Therefore, it can be concluded that the groundwater resources would guarantee the regional requirement if the meltwater volume of the mountains has not a great changes in future, moreover, water exploitation should be limited to the renewable amount of the groundwater reservoir in the western Qaidam Basin.  相似文献   

19.
塔里木河下游地区是我国西部干旱区生态环境问题比较突出的区域。本文主要从地表水(湖泊、河流和湿地)、地下水、地表植被覆盖的角度,基于多源遥感和长时间序列数据,监测和分析生态输水前后区域环境变化和生态响应。首先,采用基于知识迁移的专题图斑更新技术,实现了1990、1995、2000、2005、2010和2015年区域湿地遥感制图和植被覆盖度等生态因子指标提取;然后,以2000年为基准（生态输水起始年）,结合地下水位观测数据,对比分析了人工生态输水前后区域生态环境动态变化过程。结果显示：① 生态输水前（1990-2000年）,塔河下游的生态环境持续恶化,流域范围内一半以上的沼泽湿地消失、河道干涸,地下水位下降,区域植被覆盖大幅度下降;② 生态输水后（2000-2017年）,区域生态环境明显好转,改变了下游河道长期断流状态,区域地下水位明显抬升,地表水域（湖泊和沼泽）面积呈现“V”型逆转增加,区域植被覆盖区和覆盖度均呈现显著增加趋势,曾经一度干涸的塔河尾闾台特玛湖水域面积2017年8月达到147.87 km2。以上研究结果综合表明人工生态输水工程对塔河下游生态环境拯救和治理发挥了重要作用,遏制了生态输水前塔河下游生态环境继续恶化局面,流域生态环境正在逐步恢复。  相似文献   

20.
塔里木盆地哈拉哈塘地区具有良好油源地质条件,该地区二叠系火成岩普遍发育,复杂的岩性和剧烈的厚度变化影响下覆油气资源的勘探.为识别该地区英安岩和玄武岩这2种主要分布的火成岩,分析不同岩性的特征响应,选取有效岩性识别参数,进行多参数反演;利用基于D-S证据理论的信息融合技术对多参数反演结果进行融合,挖掘参数反演数据体的优势信息,得到岩性识别的概率体,有效避免传统波阻抗反演结果的局限性.该方法可预测主要火成岩类型在空间上的展布和厚度变化,提高岩性解释精度,在识别火成岩岩性方面取得较好效果.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号